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P0442 - Evaporative Emissions System Leak Detected (Small Leak)
P0455 - Evaporative Emissions System Leak Detected (Gross Leak)
This diagnosis detects leaks in the EVAP purge line using engine intake manifold vacuum. If pressure does not increase, the ECM
will check for leaks in the line between the fuel tank and EVAP
canister purge volume control solenoid valve under the following vacuum
test condition. The vacuum cut valve bypass valve is opened to
clear the line between the fuel tank and the EVAP canister purge volume
control solenoid valve. The EVAP canister vent control valve will then
be closed to shut the EVAP purge line off. The EVAP canister purge
volume control solenoid valve is opened to depressurize the EVAP purge
line using intake manifold vacuum. After this depressurization is
implemented, the EVAP canister purge volume control solenoid valve will
Causes: - Missing Fuel cap - Incorrect fuel filler cap used - Fuel filler cap remains open or fails to close - Foreign matter caught in fuel filler cap - Incorrect fuel tank vacuum relief valve - Leak is in line between intake manifold
Solutions: - Re-tighten or replace fuel tank filler cap - Replace damaged or leaking EVAP canister - Replace damaged or leaking lines.
I assume there is a pin-hole in the line? Easiest way is to find the leak, cut it out, and reconnect with the right size fuel hose (should be 1/4" or 3/8"). Make sure to use small hose clamps to connect the hose
Yes, it is a very good possibility that replacing the fuel pump did cause the fuel leak at the fuel tank, especially if the vehicle did not leak fuel from the fuel tank before the fuel pump was replaced, and the seal to the fuel sending unit/fuel pump assembly might have slipped out of place or was damaged when the fuel sending unit/fuel pump assembly was installed onto the fuel tank, the fuel lines might not be properly attached to the fuel sending unit/fuel pump assembly, the filler hose to the fuel tank might not be properly tightened, or even damage to a fuel line, the fuel tank itself, or a vent, from not properly installing the fuel tank into the vehicle. Those would all be a problem with quality workmanship and if any of those reasons are responsible for the fuel leak and the repairs were done at a repair facility then they should warranty the repair for their mistake at no additional cost to you.
However, road debris could also have damaged the vehicle and that would not be anything that would be covered by a warranty, and someone who is qualified and objective should inspect the vehicle to determine exactly where the fuel leak is coming from so that a proper course of action can be decided.
fuel leaks are hard to trace especially with no light under the car. raise the car as high as you can very securely start at an area were the line is dry and slowly wipe the line with a paper towel until you find wetness on it., the fuel filter is a few feet in front of the fuel tank also
Actually vapor lock refers to a condition in the intake manifold on a carbureted engine. You don't have vapor lock. What you may have is a filter inside the tank, its nicknamed a sock. Its a fine mesh screen and may be plugging up. When you pull the fuel line the fuel flows back and unblocks a small section , until it starts too **** again and re plugs. You may also have fuel pump that starts to lose power when its gets hot. Lee
Easiest way is just wrap a rag around or sometimes there is a bleeder like a tire has on the fuel rail. Now the only things that can be leaking is the Fuel Rail or The Injectors Orings or the Fuel Supply Line.
Hope this helps
The easiest way is to cut it out and replace it with a piece of steel brake line and a pair of compression fittings. Use a small tubing cutter to cut out the bad piece and clean up the ends with some emery cloth so that the ferrule will slide on the old line. Don't forget to put the nut on first.Put it together loosefirst and make sure you push the lines all the way into the fittings before you tighten the nuts. IT could leak if you don't but don't overtighten them or you will squash the line. If you can't get the old line smooth enough to slide ferrules on then get some rubber gas hose and clamps. Be sureto push the steel lines together before you tighten the clamps because the line is pressurized. You may have to double clamp the lines to prevent leaking. Once you have it together start the truck and crawl back under and check for leaks. Tighten what is leaking enoughto stop the leaks and you are good to go. Don't forget to bring a pail to catch gas when you cut the line. Hope this helps.
It's got all the symptoms of a leak in the fuel line. You may want to start backward at the tank and work your way all the way to the carb to find it but it would be surprising if it was something else. All the best. Greg
I would trace fuel lines from tank to fuel rail on motor. These are high pressure lines so do not try to quick-fix them. You will have to measure the lines and replace them if they are leaking. Unless the fuel is leaking from lines by fuel rail or by fuel filter.